Alert archive / Pennsylvania / Flash Flood Warnings in 2010

Flash Flood Warning 4, NWS Philadelphia/Mount Holly

July 13, 2010Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 13, 2010, 9:31 AM EDT for Philadelphia County, Pennsylvania. It was in force for 8 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 13, 2010, 9:31 AM EDT (13:31 UTC)
Expired: Jul 13, 2010, 5:30 PM EDT
In force: 8 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 55 km from the middle of the area, began a volume at 13:33 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jul 13, 9:46 AM EDT	FLOOD	Philadelphia, PA	FLOODING ON WISSAHICKON CREEK.
Jul 13, 10:30 AM EDT	FLOOD	Philadelphia, PA	FLOODING ON PENNYPACK CREEK.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 1.5 hours before the alert went out and 111 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 670 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 553 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

173 
WGUS51 KPHI 131331
FFWPHI
PAC101-131530-
/O.NEW.KPHI.FF.W.0004.100713T1331Z-100713T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
931 AM EDT TUE JUL 13 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 1130 AM EDT

* AT 930 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THAT OVER TWO INCHES OF RAIN HAD FALLEN IN PARTS OF THE CITY
  THIS MORNING. THE FRANKFORD CREEK WAS OUT OF ITS BANKS. ADDITIONAL
  RAIN IS EXPECTED TODAY...ALONG WITH MORE FLOODING OF ROADWAYS...
  AREAS OF POOR DRAINAGE AND SMALL STREAMS AND CREEKS.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NORTHEAST
  PHILADELPHIA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

&&

LAT...LON 4004 7499 4003 7499 4001 7504 3997 7509
      3997 7511 4007 7516 4005 7512 4013 7504
      4013 7499 4011 7497 4008 7497

$$

IOVINO

4 follow-up statements

791 
WGUS71 KPHI 131422
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1022 AM EDT TUE JUL 13 2010

PAC101-131530-
/O.CON.KPHI.FF.W.0004.000000T0000Z-100713T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PHILADELPHIA PA-
1022 AM EDT TUE JUL 13 2010

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1130 AM EDT FOR
NORTHEASTERN PHILADELPHIA COUNTY...

AT 1020 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER NORTHEAST 
PHILADELPHIA. MAJOR FLOODING WAS OCCURRING ON THE FRANKFORD CREEK.
FLOODING WAS ALSO OCCURRING ALONG OTHER STREAMS AND CREEKS, ON 
ROADWAYS AND IN AREAS OF POOR DRAINAGE.

THE HEAVY RAIN IS EXPECTED TO MOVE OUT OF NORTHEAST PHILADELPHIA BY 
1100 AM. HOWEVER, THERE WILL BE RESIDUAL FLOODING FROM THE RUNOFF.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NORTHEAST 
PHILADELPHIA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

IF FLOOD WATERS APPROACH...MOVE TO HIGHER GROUND.

&&

LAT...LON 4004 7499 4003 7499 4001 7504 3997 7509
      3997 7511 4007 7516 4005 7512 4013 7504
      4013 7499 4011 7497 4008 7497

$$

IOVINO

457 
WGUS51 KPHI 131528
FFWPHI
PAC101-131730-
/O.EXT.KPHI.FF.W.0004.000000T0000Z-100713T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1128 AM EDT TUE JUL 13 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 130 PM EDT

* AT 1113 AM EDT...BOTH PENNYPACK AND FRANKFORD CREEKS REMAINED 
ABOVE FLOOD STAGE. FOR THIS REASON...THE FLASH FLOOD WARNING HAS 
BEEN EXTENDED.

THE RESPONSE OF THESE CREEKS, DUE TO THE HEAVY RAIN, HAS BEEN 
REMARKABLE. THE WATER LEVEL AT THE PENNYPACK GAGE WAS 3 FEET AT 915 
AM THIS MORNING, ROSE TO 7 FEET AROUND 1015 AM, AND CRESTED AROUND 
8.5 FEET AROUND 1045 AM. THE WATER LEVEL AT THE FRANKFORD GAGE WAS 
1.7 FEET AROUND 815 AM THIS MORNING, ROSE TO AROUND 7 FEET AROUND 
900 AM , AND CRESTED AT AROUND 11.25 FEET AROUND 1000 AM.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NORTHEAST
  PHILADELPHIA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE 
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS 
SAFELY. MOVE TO HIGHER GROUND.

WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART CHOICE...TURN 
AROUND...DONT DROWN.

&&

LAT...LON 4004 7499 4003 7499 4001 7504 3997 7509
      3997 7511 4007 7516 4005 7512 4013 7504
      4013 7499 4011 7497 4008 7497

$$

KRUZDLO

503 
WGUS51 KPHI 131726
FFWPHI
PAC101-131930-
/O.EXT.KPHI.FF.W.0004.000000T0000Z-100713T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
126 PM EDT TUE JUL 13 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 330 PM EDT

* AT 121 PM EDT...THE PENNYPACK CREEK REMAINED ABOVE FLOOD STAGE.    
  FOR THIS REASON...THE FLASH FLOOD WARNING HAS BEEN EXTENDED. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NORTHEAST
  PHILADELPHIA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE 
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS 
SAFELY. MOVE TO HIGHER GROUND.

&&

LAT...LON 4004 7499 4003 7499 4001 7504 3997 7509
      3997 7511 4007 7516 4005 7512 4013 7504
      4013 7499 4011 7497 4008 7497

$$

KRUZDLO

557 
WGUS51 KPHI 131926
FFWPHI
PAC101-132130-
/O.EXT.KPHI.FF.W.0004.000000T0000Z-100713T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
326 PM EDT TUE JUL 13 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 530 PM EDT

* AT 319 PM EDT...THE PENNYPACK CREEK REMAINED ABOVE FLOOD STAGE.    
  FOR THIS REASON...THE FLASH FLOOD WARNING HAS BEEN EXTENDED. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NORTHEAST
  PHILADELPHIA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

&&

LAT...LON 4004 7499 4003 7499 4001 7504 3997 7509
      3997 7511 4007 7516 4005 7512 4013 7504
      4013 7499 4011 7497 4008 7497

$$

KRUZDLO

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 12, 8:12 PM EDT	Special Weather Statement	PHI	Chester	63 min
Jul 12, 8:40 PM EDT	Special Weather Statement	PHI	Philadelphia	65 min
Jul 12, 9:53 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	67 min
Jul 12, 10:42 PM EDT	Special Weather Statement	PHI	Berks	63 min
Jul 12, 11:42 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	63 min
Jul 13, 12:52 AM EDT	Areal Flood Advisory	PHI	Berks	3 hr
Jul 13, 1:06 AM EDT	Areal Flood Advisory	PHI	Berks, Chester, Montgomery	3 hr
Jul 13, 4:08 AM EDT	Areal Flood Advisory	PHI	Berks	115 min
Jul 13, 5:58 AM EDT	Special Weather Statement	PHI	Delaware	62 min
Jul 13, 6:07 AM EDT	Areal Flood Advisory	PHI	Chester, Delaware	113 min
Jul 13, 6:20 AM EDT	Flash Flood Warning	PHI	Delaware	115 min
Jul 13, 7:42 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Jul 13, 9:17 AM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery, Philadelphia	118 min
Jul 13, 9:41 AM EDT	Flash Flood Warning	PHI	Montgomery, Philadelphia	2 hr
Jul 13, 10:28 AM EDT	Flash Flood Warning	PHI	Bucks, Montgomery, Philadelphia	3 hr
Jul 13, 10:38 AM EDT	Areal Flood Advisory	PHI	Bucks	3 hr
Jul 13, 2:48 PM EDT	Flash Flood Watch	PHI	Delaware, Philadelphia	19 hr
Jul 13, 3:08 PM EDT	Excessive Heat Watch	PHI	Delaware, Philadelphia	63 hr
Jul 13, 5:29 PM EDT	Areal Flood Advisory	PHI	Philadelphia	117 min

Nearby

Flash Flood Warnings in Pennsylvania, 2010 Every flash flood warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.